x86_64: Update to stabilized cmpxchg16b_target_feature#80
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…ailable SGX doesn't support CPUID. Currently, on this target, if the cmpxchg16b feature is not enabled at compile time, detect::has_cmpxchg16b will always return false. So, enabling outline-atomics on this target does not make sense since the fallback implementation is always used.
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cmpxchg16b_target_feature has been stabilized in rust-lang/rust#106774.